add-apt-key is described as 'This command line tool can be used to add a GPG key to your APT key ring'. There are three alternatives to add-apt-key for Linux and OpenPGP. The best alternative is Y PPA Manager, which is both free and Open Source. Other great apps like add-apt-key are launchpad-getkeys (Free, Open Source) and Introduce PPA (Free, Open Source).
- 3 alternatives